Cardiac Mapping Surface Reconstruction Off-Surface Point Filtering
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Solution Overview
Problem
During cardiac mapping, it is challenging to accurately distinguish and reject points from the point cloud that are not on the endocardial surface, leading to incomplete or inaccurate surface reconstruction of the heart.
Innovation Solution
A method is developed to generate a cardiac map by receiving recordings from a mapping catheter, constructing a three-dimensional surface of the heart, performing surface analysis to identify off-surface points, and selectively moving these points to the surface based on a predefined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If surface reconstruction techniques (interpolation, smoothing, filtering) are applied to the point cloud, then a continuous cardiac surface can be generated, but points not on the endocardial surface cannot be reliably distinguished and rejected
Solution Approach 1:
The patent segments the point cloud into two distinct categories: on-surface points and off-surface points. By calculating the perpendicular distance from each point to the reconstructed surface, the system divides points into those lying on the surface (distance ≈ 0) and those not on the surface (distance > threshold). This segmentation enables reliable identification and rejection of off-surface points while preserving the continuity of the reconstructed cardiac surface.
2Productivity
If all acquired points are used for surface reconstruction, then the point cloud defines the complete acquired data, but inaccurate surface representation results from inclusion of intracardiac space points
Solution Approach 1:
The patent performs preliminary surface reconstruction using all acquired points to create an initial cardiac surface model. This preliminary action allows subsequent filtering of off-surface points based on their distance to the reconstructed surface. The system calculates perpendicular distances from each point to the surface and rejects points exceeding a predefined threshold, thereby achieving accurate surface representation while maintaining mapping efficiency.
3Manufacturing precision
If surface analysis is performed to identify off-surface points, then points not on the endocardial surface can be rejected, but the complexity of the mapping system increases
Solution Approach 1:
The patent replaces complex mechanical or manual point filtering methods with a computational approach. The system uses automated surface reconstruction algorithms (such as marching cubes or radial basis functions) and calculates perpendicular distances from points to the reconstructed surface using mathematical operations. This substitution of mechanical filtering with computational geometry simplifies the overall system while achieving high precision in identifying and rejecting off-surface points.
Data Source
AI summary
According to one embodiment, a method for generating a cardiac map is disclosed. The method comprises during cardiac mapping in which a mapping catheter is inserted into a heart, receiving a plurality of recordings from the mapping catheter, each recording includes a voltage, and the spatial coordinates of a recording site within the heart indicative of an electrode position of the mapping catheter at the time of acquisition of said voltage, constructing a three-dimensional surface of the heart based on the spatial coordinates of each recording site, performing surface analysis to determine off-surface points in the plurality of recordings where each off-surface point corresponds to a recording from the plurality of recordings which does not lie on the three-dimensional surface, and selectively moving at least some of the off-surface points to the three-dimensional surface based on a predefined threshold.